The reasons why I don’t believe Flat Earth is because I’ve seen the curve of the earth. It is visible from any beach as we watch ships sailing beyond the horizon. They go down slowly over the horizon. To me, that proves it.

Also, these scriptures tell us the earth is round.

He has inscribed a circle on the surface of the waters at the boundary of light and darkness. (Job 26:10)

When He established the heavens, I was there, when He inscribed a circle on the face of the deep,

(Proverbs 8:27)

It is He who sits above the circle of the earth, and its inhabitants are like grasshoppers, who stretches out the heavens like a curtain and spreads them out like a tent to dwell in. (Isaiah 40:22)

Beyond that, there are zillion photos of the earth from outer space showing it is round.